Question: An elevator uses a cable having a weight density of3 lb/ft. When the elevator is at the first floor,100 ft of cable extend down from

An elevator uses a cable having a weight density of3

lb/ft. When the elevator is at the first floor,100

ft of cable extend down from a motor located at the top of the building.

If0

ft are extended when the elevator reaches the top, how many ft-lbs of work does the motor do just lifting the cable as the elevator rises from the first floor to the top?

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